Radeon R9 M385X vs Radeon RX 580

Intro

Compare those specs to the Radeon RX 580, which features core clock speeds of 1257 MHz on the GPU, and 2000 MHz on the 8192 MB of GDDR5 memory. It features 2304 SPUs along with 144 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon RX 580 should be a lot faster than the Radeon R9 M385X overall. (explain)

Radeon RX 580		262144 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 166144 (173%)

Texel Rate

The Radeon RX 580 should be a lot (approximately 194%) better at anisotropic filtering than the Radeon R9 M385X. (explain)

Radeon RX 580		181008 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 119408 (194%)

Pixel Rate

The Radeon RX 580 will be a lot (approximately 129%) faster with regards to AA than the Radeon R9 M385X, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon RX 580		40224 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 22624 (129%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.